There are ebooks for online reading and free download by Garay, Juan de on this page. Also you can read a bio of Garay, Juan de.

Juan de Garay (1528–1583) was a Spanish conquistador. Garay was born in Orduña, Spain. He served under the Spanish king, first in the Viceroyalty of Peru, and then at the Viceroyalty of the Río de la Plata. He was governor of Asunción (present day Paraguay) and founded a number of cities in Argentina, many near the Paraná River area, as well as the second foundation of Buenos Aires, in 1580....